Hematological alterations caused by high intensity of L 3 larvae of Contracaecum sp Railliet & Henry, 1912 (Nematoda
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ORIGINAL PAPER
Hematological alterations caused by high intensity of L3 larvae of Contracaecum sp Railliet & Henry, 1912 (Nematoda, Anisakidae) in the stomach of Hoplias malabaricus in lakes in Pirassununga, São Paulo Lincoln L. Corrêa & Letícia C. Karling & Ricardo M. Takemoto & Paulo S. Ceccarelli & Marlene T. Ueta
Received: 28 October 2012 / Accepted: 28 April 2013 / Published online: 11 May 2013 # Springer-Verlag Berlin Heidelberg 2013
Abstract The objective of the present study was to discover the hematological indices of Hoplias malabaricus infected by larvae of Contracaecum sp. A total of 105 fish were collected from two lakes located in the municipal district of Pirassununga, São Paulo, Brazil, of which 95.2 % were infested by L3 larvae of Contracaecum sp., with an average intensity of 348.7±231.55 helminths/fish. A total of 76 fish were analyzed to establish hematological parameters. Following analysis, it was found that there was a significant difference between hematological parameters Hct, erythrocytes (Er), thrombocytopenia (p=0.01), and Hb (p=0.02) in lakes A and B, while there was no significant difference for leukocyte (p=0.68), mean corpuscular volume, mean corpuscular hemoglobin (p=0.06), and mean corpuscular hemoglobin concentration (p=0.47). The intensity of infection correlated negatively with Er (rs =−0.42; p
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